Adjustable limit-gage.



Patented lan. 2, |900.

INVENT'DH.

JACOEB D. Cox. JR

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JACOB n. CoX, Jn., or CLEVELAND, omo.

ADJUSTABLE SPEGIFICATTUN forming part of Letters Eatent No. 640,448,dated January f2, 1900.

Application filed April 5, 1899. Serial No. 711,833. (No modolJ To al?,whom, it zmy/ concern:

Be itknown thatl, JACOB D. COX, Jr., a citizen ofthe UnitedStates,residing at Cleveland, in the county of Cuyahoga and State ofOhio, have invented certain new and useful lmprovements in AdjustableLimit-Gages; and l do declare that the following is a full, clear, andexact description of the invention, which will enable others skilled inthe art to which it appertains to make and use the same.

lily invention relates to improvements in what may be termed adjustablelimitgages; and the object of my invention is to provide a gage or toolwhich is adapted to make at least two difterent measurements or tests ofa piece of work in practically the same movement and without change ofthe tool or the work therein and in which the immediate gaging mechanismor points are adaptable to a wide range of sizes and kinds of work, allsubstantially as shown and described, and particularly pointed out inthe claims.v

in the accompanying drawing the invention is illustrated in a singlefigure, which represents a perspective elevation ot' my new and improvedgage or so-called tool.

A. is the body of the gage or tool, having by preference a substantiallyU shape and fashioned with two arms or sides having their outer portions2 and 3 parallel to each other. The gage mechanism is set in these armsand comprises two threaded or fixed plugs a and 5 side by sidesuccessively in the arm 3 and two oppositely-arranged adjustable screws6 and 7, provided with milled heads, to be easily rotated by hand, andhaving jam-nuts S and 9, respectively, to lock them firmly in any adjusted position.

l am of course aware that a great variety of gages of widely differentconstructions and designed for a large variety of uses have long sincebeen known and that differential gages or gages with a `plurality ofdeterminingpoints in themselves are not, broadly, new 5 but l am notaware that any one has everbefore known or used a gage which has thenovel features and advantages of the present invention. For example, lam acquainted with a gaging-tool which has a set of fixed jaws at eachend resembling an old-fashioned castiron wrench having two or more pairsof jaws for different sizes of nuts. In the said gag ing-tool the jawsat one end are accurately graduated to a given size and the jaws at theother end are graduated to a less or a larger size, and the two sizesdiffer; but the jaws at both ends are fixed, and in use the tool has tobe reversed or turned end for end to apply it to the work.

Of course in tools of the kind to which my invention relates it is knownto be essential that at least two measurements should be made, not somuch that either alone shall accomplish the whole result, but that bymeans of the two together a complete and satisfactory result may bearrived at. This occurs by having one sere say the first-adjusted todetermine the maximum size of the article being gaged, whatever it maybe. Then having passed this test and entered in past screw C and itscompanion part or plug il the fact that the article is su flicientlyreduced in size is evident, or otherwise it would have been stopped bythe gage-points 4 and (55 but whether it is not too small remains yet tobe determined. rlhis requires another measurement wherein thegage-points next to be tried are set correspondingly closer than in thefirst instance, and the diit'erences between the two sets of points maybe exceedingly line, if desired. In the present case the difference isgreat enough to be discernible by the eye, especially by the aid of theobject or article B, which is intercepted by the screw 7. In making thissecond measurement the stock or article B projects through between plug1i and screw 6, and they are thus utilized as guides and helps in takingthe further measurement, and this might be succeeded by still another,it desired-that is, a third set of gage-points could be introduced inthe same tool or instrument, and by set7 I mean one of the screws andits companion plug or part below. It will be noticed, therefore, thatall the measurements are taken by adjustable means and that when thetool is applied to the stock or the stock to the tool for making onemeasurement it is carried along without removal to the next succeedingtest or tests, one or more.

Instead of separate points l and 5 there might be a continuous piecelaid in or fixed to that arm and serve the same purpose iu IOGconnection with the two screws; but the separate formation is deemedaltogether preferable.

In lieu of screws 6 and '7 l might use any equivalent thereof, such asan unthreaded stem or pin inserted in the same place and relation of thescrews and held adj ustably therein by means of clamps or otherequivalent means adapted to` lock the pins in any adjusted position. Oneway of clam pingwould be to split the arm on the line of the pins andbolt through transversely to tighten them up. The same might also bedone in the other arm carrying the points 4 and 5. Hence the inventioncomprises, broadly, a plurality of adjustable gage-points in a tool ofthis kind adapted to effect successive gaging from one depth to anotherwithout reversing or removing the tool.

What I claim is- 1. As a new article of manufacture, an adjustablelimit-gage having a body and two opposite arms formed in a single piece,a plurality of independently-adjustable gagingpoints projecting throughone arm and matching points in the opposite arm, said points in botharms being set successively one behind the other from the ends of thearms, whereby in using the gage one set of opposed points is Y JAcoB D.cox, JR.

Witnesses:

H. T. FISHER, R. B. MosEP..

